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POWER QUALITY
SOLUTION
Infolliance take
up projects in Harmonics involving harmonic audit,
recommendation and installation of filters. The
products and services in this area covers the
following:
• Harmonic
Audit
• Recommendation
of Filter System
• Supply &
commissioning of Filter System
Modern industries requires automation of their
operation enabling them to produce quality products
and also for mass production. The conventional
systems are being replaced by modern Power Electronic
systems, bringing a variety of advantages to the
users. Classic examples are D.C. & AC Drives,
UPS, soft starters, etc. Since the thyristor converter
technology is rapidly gaining ground in the modern
industrial plants, the power supply systems are
contaminated as the ideal sinusoidal current and
voltage waveforms are getting distorted. This
in turn is affecting the performance of the equipment
in the electrical network, especially the Power
Factor correction capacitors.
I. Sources of Harmonics:
Non linear loads as mentioned below are the
main sources of Harmonics in the electrical network:
1. AC Variable Frequency Drives
2. D.C. Thyristor Converter Drives
3. Induction Furnaces & Thyristor Controlled
Furnaces
4. Rectifiers
5. UPS & SMPS (Used in Computers & Automation
Systems)
6. Electronic Ballast
II. Effects of Harmoncs:
• Increased
heating due to iron and copper losses in machines
at higher frequencies.
• Harmonic current
pairs such as 5th and 7th have potential to create
mechanical oscillation in Motor-Load or Turbine-Generator
combination. This in turn may produce oscillating
torque. Also, these harmonic currents generate
heat in the electrical network and in motor windings
in both stator and rotor.
• Harmonics
create increased level of noise and harmonic current
causes additional copper and stray flux losses.
Harmonic voltages cause increase in iron losses.
• Cables may
have voltage stress and corona leading insulation
failure and also higher, skin effect.
• Failure of
Power Factor improvement capacitors and Poor Power
Factor
• Power electronic
equipment are susceptible to mis-operation caused
by harmonic distortion (shift in voltage crossing).
• The accuracy
of Meters and instruments can be affected with
high harmonic distortions and may show erratic
readings.
• Harmonic currents
in switch gear increase heating and thus excess
losses. It can also affect operation of relays.
• Energy Losses
III. Solution to Harmonics:
Distortion in the voltage and current wave form
is not desirable in the electrical network because
of their adverse impact on the connected equipment.
It is therefore, prudent to install tuned harmonic
filters close to the loads generating harmonic
currents so that the harmonic currents are filtered
at the source and relieving the network from the
evil effects of harmonics. A Harmonic Filter system
basically consists of Capacitor bank connected
in delta and a series reactor. These will be housed
in a suitable panel along with necessary switch
gear and meters. The filter injects required kVAr
to the network and improve the Power Factor till
the tuned frequency and beyond the tuned harmonic
frequency, it will be inductive and thus prevent
amplification of harmonic currents.
IV. The Benefits by installing Harmonic Filter
System:
• Reduction
in Energy Losses & reduced energy bill
• Reduction
in unexpected demand of energy due to harmonic
currents
• Less equipment
failure and maintenance
• Increase in
available capacity
• Increase in
life of electrical equipment, measuring instruments
and cables
• Lower work
interruption and downtime
• Lower maintenance
costs
• Improved system
efficiency
• Lower maintenance
• Improved safety
• Improved system
power factor
For further details please download Presentation
& Catalogue: 
Downloads
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SOLUTIONS FOR EFFICIENT MANAGEMENT OF ELECTRICAL
ENERGY REGULATION 2008